Actually it seems that arrow keys are already supported for player movement in the jam version. Post-jam version will have a setting to switch between QWERTY and AZERTY keyboard layouts, so you will be able to use ZQSD if you are on an AZERTY keyboard. I'm not sure I can handle anything other than that for now. Though if ESDF opens things up further I will add that as an option.
Indeed arrow keys are working, great! At last I could enjoy your game, excellent visuals and sound, love the small scope perfectly fitting the jam. It's fun, and my kind of difficulty: first try was a mess, then I could make it once I understood what to do. Didn't feel the need for a tutorial. Sure it cries for a post jam version with more levels ;). Good game with simple concept and solid gameplay, and again the art is what really sells it. Really love the palette and simple, very legible graphics, as well as the tunes and sfx.